A6410 Valve and Case Expansion Monitor for AMS 6500 Machinery Health Monitor
The Valve and Case Expansion Monitor is designed for high reliability for the plant’smost critical rotating machinery. This 1-slot monitor is used together with other AMS 6500 monitors to build acomplete API 670 machinery protection monitor.Applications include steam, gas, compressors and hydro turbomachinery.
The main functionality of the Valve and Case Expansion Monitor is to accurately monitor valve position and case expansion and reliably protect machinery by
comparing parameters against alarm setpoints, driving alarms and relays.Valve position is a measurement of the main steam inlet valve stem position normallydisplayed in percent open. The valve position measurement provides the operator withan indication of the current load on the turbine.Case expansion monitoring usually consists of two inductive displacement sensor(or LVDT’s) mounted in the axial direction, parallel to the shaft, and on each side of the turbine case. Unlike the eddy current sensor which is a non-contact sensor, theinductive sensor is a contact sensor.
Case expansion monitoring is important at start-up, so both sides of the turbine case can be monitored for proper expansion rates. Because the turbine is allowed to slide
on rails as it expands, if both sides are not free to expand, the turbine “crabs” (the casebends), leading to the rotor colliding with the case.Channel 1 can measure static values, such as case expansion, and can also be used for dynamic quantities, such as displacement, angles, forces, torsions or other physicalquantities measured by inductive transducers. Channel 2 is left for static measurements and relative displacements (relative to channel 1).
The AMS 6500 Machinery Health Monitor is an integral part of PlantWeb® and AMS software. PlantWeb provides operations integrated machinery health combined withthe Ovation® and DeltaV™ process control system. AMS software provides maintenance personnel advanced predictive and performance diagnostic tools to confidently and accurately determine machine malfunctions early.

· Two-channel, 3U size, 1-slot plugin module decreases cabinet space requirements in half from traditional four-channel 6U size cards
·API 670 compliant,hot swappable module
· Password protected user configuration
·Self-checking facilities includemonitoring hardware, power input,hardware temperature, sensorand cable
· Front and rear bufferedand proportional outputs,0/4-20 mA output, 0 – 10 V output
· Use with inductive displacementsensor 9350

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